JP2019209445A - Cutting device - Google Patents

Abstract

To smoothly receive and deliver a plurality of rectangular flat materials to the other device on a downstream side even if the widths of the flat materials are changed in a cutting device for cutting the flat materials successively transferred from a supply device in order.SOLUTION: A cutting device includes: conveyance means which has a conveyance path for intermittently conveying flat materials at a prescribed pitch; first punching means which punches a corner section at one end of a conveyance direction upstream side or downstream side of each conveyed flat material and is movably arranged in a conveyance direction; second punching means which punches a corner section at the other end of the conveyance direction upstream side or downstream side of each conveyed flat material and is movably arranged in the conveyance direction on the downstream side of the first punching means; input means which receives input of a conveyance direction length of each flat material; and control means which determines the pitch by the conveyance means and the position in the conveyance direction of at least one of the first punching means and the second punching means on the basis of at least the conveyance direction length of each flat material and a conveyance path length.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a cutting apparatus.

  Patent Document 1 discloses a cutting device that cuts a corner of a bag to be conveyed. In this cutting apparatus, after a bag is transported at a predetermined transport pitch, the bag is transported by stopping for a predetermined time and repeating this. When the conveyance is stopped, as shown in FIG. 16, the corners of the rectangular bags 800 and 900 arranged in the front and rear in the conveyance direction are simultaneously cut to form the corners in an arc shape. Has been. More specifically, as shown in FIG. 16, the corner 801 at the upstream end of the downstream bag 800 and the corner 901 at the downstream end of the upstream bag 900 are brought close to each other to face each other. The corners 801 and 901 to be cut are cut by one blade member 850.

JP 2011-56837 A

  By the way, in order to simultaneously cut the corners of the bags lined up and down, the interval between adjacent bags needs to be the same even if the width of the bags changes. However, this configuration causes the following problem. That is, the bag that has passed through the cutting device is supplied to another transport device and subjected to the following processing. Here, in such a cutting apparatus, not only bags having the same width in the conveying direction but also bags having different widths may be cut. However, even when bags with different widths are cut, the gap between the bags must always be the same. Therefore, when the width of the bag changes, it is necessary to transfer it to another transfer device on the downstream side of the transfer path. The position will change. In other words, the conveyance path stops intermittently, but the stop position when delivering to another conveyance device at the most downstream position varies depending on the width of the bag, and the delivery to the conveyance device may not be performed smoothly. . In addition, such a problem is a problem that can occur not only in cutting bags, but also in general cutting of corners of flat materials such as sheet materials.

  The present invention has been made to solve this problem, and provides a cutting apparatus that can smoothly deliver to another apparatus on the downstream side even if the width of a flat material to be cut changes. The purpose is to do.

  The present invention is a cutting device that sequentially cuts a plurality of rectangular flat materials sequentially transferred from a supply device, and has a conveyance path for intermittently conveying the flat materials at a predetermined pitch; In the flat material conveyed by the conveying means, a first punching means, which is disposed so as to be movable in the conveying direction by punching a corner of one end of the upstream side or the downstream side in the conveying direction; In the flat material conveyed by the conveying means, the corner of the other end of the upstream side or the downstream side in the conveying direction is punched out, so that it can move in the conveying direction downstream from the first punching means. Based on the second punching means arranged, the input means for receiving the input of the length of the flat material in the transport direction, and at least the length of the flat material in the transport direction and the length of the transport path, It includes said pitch by the conveying means, and control means for determining the position in at least one of the transport direction of the first punching means and the second punching means.

  According to this configuration, the following effects can be obtained. That is, the corners of the upstream and downstream ends of the flat material to be cut are cut by different punching means. Further, the position of at least one of the punching means in the transport direction can be adjusted. Therefore, by adjusting the transport pitch by the transport means and the position of the punching means, the flat material can be accurately cut at the corners at both ends even if the length in the transport direction of the flat material changes. It is possible to align the stop position when the toner is discharged from the transport path. Accordingly, since the flat material discharged from the conveyance path can be delivered to the downstream conveyance device at the same position, for example, in the downstream device, a different receiving position is set for each flat material width. The subsequent processing on the flat material can be performed smoothly without performing complicated processing. The “same position” does not have to be exact, and may be slightly shifted as long as it does not provide support for delivery to a downstream apparatus.

  In the cutting apparatus, the control unit can determine the positions in the transport direction of both the first punching unit and the second punching unit. Thereby, it can respond to the flat material of various widths.

  In the cutting apparatus, the transport unit is configured to transport the flat material along a plurality of rows extending in the transport direction, and the first punching unit and the second punching unit are configured to each of the rows. One end of the flat material and the corner of the other end can be punched out.

  Thereby, since it can cut simultaneously with respect to the flat material conveyed by multiple rows | lines, the efficiency of a process can be improved.

  In the cutting apparatus, the conveying means includes at least one drive pulley, at least one driven pulley, an endless belt that is spanned between the drive pulley and the driven pulley, and has a plurality of through holes, and the flat member. In a portion corresponding to a transport path for transporting the belt, a support base that supports the endless belt, and a suction that is provided on the support base and sucks air through the through hole from the outside to the inside of the endless belt. And at least one of the driving pulley and the driven pulley is formed in a gear shape, and the inner surface of the endless belt is provided with teeth of the driving pulley or the driven pulley formed in a gear shape. A plurality of protrusions to be engaged are formed, the plurality of protrusions extend in a direction orthogonal to the transport direction, and are arranged at a predetermined interval in the transport direction, The inner surface of the end belt is provided with a flat region where the protrusion is not formed at a portion corresponding to the region where the through hole is formed, and the support base is positioned corresponding to the flat region. Further, the support surface may be in contact with the inner surface of the endless belt, and a suction port for sucking air by the suction means may be formed on the support surface.

  According to this configuration, since the pulley is formed in a gear shape, and the endless belt includes a protrusion that engages with the teeth of the pulley, slipping between the pulley and the endless belt can be prevented, The endless belt can be driven at high speed. On the other hand, a flat region where no protrusion is formed is formed in the portion where the through hole is formed on the inner surface of the endless belt, and this flat region is in contact with the support surface that supports the endless belt. It is configured. A suction port is formed on the support surface. Therefore, since air is sucked through the through hole at the portion where the flat region is in contact with the support surface, it is possible to prevent air from leaking. With the above configuration, the time from the suction start position until the flat material is adsorbed is shortened, and even if the flat material is conveyed at high speed, it can be sucked firmly so that the flat material does not shift, The processing capacity and punching accuracy of the apparatus can be improved.

  In the cutting apparatus, the plurality of through holes are formed along a plurality of rows along the transport direction, and in at least one pair of adjacent rows, the through holes are staggered so as not to be aligned in the horizontal direction. It may be formed.

  According to this configuration, since the through holes formed in a plurality of rows are arranged in a staggered manner so as not to line up in the horizontal direction, the through holes in any row are not in contact with the flat material in the transport direction. However, since the suction leakage is reduced and the through holes in the other rows can be in contact with the flat material, for example, the end portion of the flat material can be reliably sucked. As a result, the flat material can be firmly fixed to the endless belt over the entire conveyance direction.

  In the cutting apparatus, the first and second punching means have a punching blade, and an edge of the punching blade is formed from an arc portion that cuts the corner portion into an arc shape, and both sides of the arc portion. Each of the arc portions may include a pair of straight portions extending in a tangential direction of each end portion.

  According to this configuration, since the edge portion of the blade is configured by connecting the linear portion extending in the tangential direction to both ends of the arc portion, the punching position is shifted, and the arc portion and the linear portion are Even if the corner portion is cut by the connecting portion, since the connecting portion does not have the corner portion, it is possible to prevent the occurrence of burrs due to the connecting portion.

  According to the cutting device according to the present invention, even if the width of the flat material to be cut changes, the delivery to other devices on the downstream side can be performed smoothly.

It is a top view of the bag used as the cutting object. It is a side view showing one embodiment of the cutting device concerning the present invention. It is a top view which shows the inner surface of an endless belt. It is a partial top view of a support stand. It is the sectional view on the AA line of FIG. It is sectional drawing which shows the upper blade member of a 1st punching unit. It is a top view which shows the lower blade member of a 1st punching unit. It is sectional drawing which shows the upper blade member of a 2nd punching unit. It is a top view which shows the lower blade member of a 2nd punching unit. It is a model figure of conveyance of the bag concerning pattern 1. It is a model figure of conveyance of the bag concerning pattern 2. It is sectional drawing of the conventional upper blade member. It is sectional drawing (a) which shows the state from which the cutting position of the upper blade member of FIG. 12 shifted | deviated, and the top view (b) which shows the corner part of the cut bag. It is sectional drawing (a) which shows the state from which the cutting position of the upper blade member of FIG. 6 shifted | deviated, and the top view (b) which shows the corner part of the cut bag. It is sectional drawing which shows the other example of the 1st punching unit. It is sectional drawing which shows a punching unit.

  Hereinafter, an embodiment in which the cutting device according to the present invention is applied to bag cutting will be described with reference to the drawings.

<1. Overview of bags to be cut>
First, a bag (flat material) to be cut will be described with reference to FIG. FIG. 1 is a plan view of a bag to be cut. As shown in the figure, the bag 10 is obtained by fixing the peripheral edges of two sheet materials formed of a resin material or the like in a rectangular shape by fusion or the like. And in a cutting device, this bag 10 is conveyed so that a short side follows a conveyance direction, and four corners are cut in circular arc shape. Hereinafter, a pair of corners on the upstream side in the transport direction is referred to as a first corner 11, and a pair of downstream corners is referred to as a second corner 12. As will be described later, the cutting device is configured to cut the second corner 12 after cutting the first corner 11. In addition, the “width of the bag (flat material)” in the present specification refers to the length in the transport direction in the cutting device.

<2. Outline of cutting device>
FIG. 2 is a schematic configuration diagram of the cutting apparatus according to the present embodiment. As shown in the figure, the cutting device according to this embodiment intermittently conveys the above-described bag 10 at a predetermined conveyance pitch by a conveyance path having an endless belt. That is, after the bag 10 manufactured by the upstream bag making apparatus (supply apparatus) 100 is received, the endless belt is moved by a predetermined transport pitch, and the bag 10 is transported, and then stopped for a predetermined time. By repeating this, the bag 10 is supplied to the processing apparatus 200 on the downstream side. In the middle of the conveyance path, when the endless belt is stopped, the corners 11 and 12 are cut by a punching unit which will be described later. Further, in the vicinity of the most downstream of the endless belt, even bags having different widths are stopped at the same position, and the bags 10 are delivered to the downstream processing apparatus. Hereinafter, after describing the configuration of the cutting apparatus, control related to conveyance will be described.

  FIG. 2 is a side view of the cutting device. As shown in FIG. 2, the cutting device includes a driving pulley 21, a driven pulley 22, and an endless belt 23 that are stretched between the pulleys 21 and 22. I have. A servo motor (not shown) is connected to the drive pulley 21, and the endless belt 23 is intermittently driven at a predetermined pitch when the drive pulley 21 is intermittently rotated by the servo motor. ing.

  The lower surface of the endless belt 23 passing through the upper side is supported by the support 3. On the other hand, on the upper surface of the endless belt 23 passing through the upper side, the above-described bag 10 is supplied at a predetermined interval and conveyed. Therefore, the upper surface of the endless belt 23 constitutes a conveyance path for the bag 10. In the present embodiment, the bag is conveyed from the right side to the left side in FIG. 2, and the right side is assumed to be the upstream side or the rear side, and the left side is assumed to be the downstream side or the front side. In addition, a direction orthogonal to the transport direction may be referred to as a width direction.

  Further, the cutting device includes a first punching unit 4 for cutting the corners 11 and 12 of the bag 10 conveyed by the endless belt 23, and a second punching unit 5 disposed on the downstream side of this. Has been placed. Various controls of the cutting device such as conveyance of the endless belt 23 and positions of the punching units 4 and 5 are performed by the control unit 7 (control means). Hereafter, each member mentioned above is demonstrated in detail.

<2-1. Pulley, endless belt, and support base>
Teeth extending in the axial direction are formed on the outer peripheral surfaces of the pulleys 21 and 22. That is, each pulley 21 and 22 is formed in a gear shape.

  A plurality of protrusions 231 are formed at predetermined intervals on the inner surface of the endless belt 23 (hereinafter referred to as the inner surface, and the opposite surface is referred to as the outer surface), that is, the surface on which the pulleys 21 and 22 are stretched. These protrusions 231 engage with the teeth of the pulleys 21 and 22. More specifically, as shown in FIG. 3, on the inner surface of the endless belt 23, protrusions 231 extending in the width direction are formed at both ends in the width direction (direction orthogonal to the transport direction). They are arranged at a predetermined interval. Further, a flat region 233 is formed in the center of the endless belt 23 in the width direction, that is, between the protrusions 231 at both ends, and a plurality of through holes 232 are formed in the flat region 233.

  In the present embodiment, a plurality of through holes 232 are formed along four rows arranged in parallel with the transport direction. However, among the four rows, at least one set of the through holes 232 are arranged in a staggered manner so as not to line up in the width direction.

  4 is a partial plan view of the support base, and FIG. 5 is a cross-sectional view taken along line AA of FIG. As shown in FIGS. 4 and 5, the upper surface of the support base 3 is configured to be in contact with the lower surface of the endless belt 23 that passes through the upper side. A pair of groove portions 31 in which the portion 231 is accommodated are formed. A flat support surface 32 in contact with the flat region 233 on the inner surface of the endless belt 23 is formed between the groove portions 31, and air is sucked into the support surface 32 by suction means such as a compressor (not shown). A suction port 33 is formed for this purpose. As described above, since the plurality of through holes 232 are formed in the flat region 233, when air is sucked from the suction port 33, the air is sucked through the through holes 232. As a result, the bag 10 is sucked to the outer surface of the endless belt 23 so that no positional deviation occurs during conveyance.

<2-2. Punching unit>
Since both the punching units 4 and 5 have substantially the same configuration, the first punching unit 4 will be mainly described here, and different portions will be described later.

  6 is a cross-sectional view of the upper blade member, and FIG. 7 is a plan view of the lower blade member. The first punching unit 4 is an apparatus for cutting the first corner 11 of the bag 10 and forming it in an arc shape. Therefore, as shown in FIGS. 6 and 7, a pair of upper blade members 41 arranged in the longitudinal direction of the bag 10, a pair of lower blade members 42 disposed below these upper blade members 41, and the upper blade member 41. And a drive unit (not shown) that moves up and down. Further, the first punching unit 4 has an adjustment mechanism (not shown) that can adjust the distance between the pair of upper blade members 41 in the longitudinal direction of the bag 10 and the distance between the pair of lower blade members 42 in the longitudinal direction of the bag 10. And a moving mechanism (not shown) for moving the first punching unit 4 in the transport direction.

  As shown in FIG. 6, each upper blade member 41 is bilaterally symmetric, has a substantially triangular cross section, and is arranged so that the hypotenuse faces the downstream side. And the 1st corner part 11 is cut | judged with the cutting blade 411 which comprises this oblique side. More specifically, the cutting blade 411 includes an arc part 413 having an arcuate cross section and a pair of linear parts 414 and 415 extending obliquely in a tangential direction from both ends of the arc part 413. Both the straight portions 414 and 415 are arranged so as to intersect each side sandwiching the corner of the bag 10, and the intersecting angle θ is 30 degrees or less, preferably 20 degrees or less, and at the end of the arc portion 413. It arrange | positions so that it may contact | connect as a tangent.

  A lower blade member 42 is disposed below each upper blade member 41. As shown in FIG. 7, the two lower blade members 42 are arranged so as to sandwich the endless belt 23 and the support 3 in the longitudinal direction of the bag 10 in plan view, and the upper surfaces of the lower blade members 42 are The endless belt 23 is installed so as to have substantially the same height as the upper surface.

  As shown in FIG. 7, each lower blade member 42 has the same cross-sectional shape as the upper blade member 41, ie, the recessed part 420 of a cross-sectional triangle shape so that the corresponding upper blade member 41 may fit. The oblique sides of the opening periphery of each recess 420 constitute a cutting blade 421, and the cutting edge 411 of the upper blade member 41 and the cutting blade 421 of the lower blade member 42 circulate the first corner 11 of the bag 10. It is designed to cut in an arc.

  The first punching unit 4 configured as described above is movable in the transport direction by the moving mechanism. That is, the first corner 11 can be cut at an arbitrary position on the transport path. More specifically, the cutting device is provided with a guide rail (not shown) extending in the transport direction, and the first punching unit 4 can move in the transport direction along the guide rail. . A rack (not shown) is arranged in parallel with the guide rail, and a pinion (not shown) that meshes with the rack is attached to the first punching unit 4 so as to be rotatable. Therefore, when the pinion is rotationally driven by the control unit 7, the first punching unit 4 can be disposed at an arbitrary position in the transport direction.

  On the other hand, as shown in FIGS. 8 and 9, the second punching unit 5 is configured similarly to the first punching unit 1, but the directions of the upper blade member 51 and the lower blade member 52 are different. That is, the upper blade member 51 and the lower blade member 52 of the second punching unit 5 are arranged such that the cutting blades 511 and 521 that are the hypotenuses face the upstream side in the transport direction. Thereby, the second corner 12 of the bag 10 is cut. The second punching unit 5 is also movable in the transport direction by the same configuration as the first punching unit 4.

<2-3. Control unit>
Next, the control unit 7 will be described. The control unit can be configured by a known computer such as a PLC (Programmable Logic Controller). As described above, even in the case of the bag 10 having different widths, the corners 11 and 12 are accurately punched, and the bag is stopped at the same position in the vicinity of the most downstream of the conveyance path, so that the downstream processing device Therefore, the control unit 7 can control the transport pitch of the endless belt 23 and the positioning of the punching units 4 and 5. In addition, the control unit 7 can also control the conveyance speed and stop time of the endless belt 23 in order to adjust the processing speed. Further, the control unit 7 is provided with an input device (not shown: input means) such as a numeric keypad, a keyboard, and a touch panel for inputting the width of the bag 10 in the conveyance direction.

  By this control unit 7, the cutting process of the bags 10 having different widths can be set as follows. First, the receiving position of the bag 10 from the bag making apparatus 100 and the delivery position of the bag 10 to the processing apparatus are determined in advance. The receiving position is a stop position of the bag 10 at the uppermost stream in the transport path. In this embodiment, the upstream edge of the bag 10 coincides with the uppermost stream point of the transport path. The delivery position is a stop position at the most downstream side in the conveyance path, and the bag 10 is arranged with a width D1 from the most downstream point of the conveyance path. These receiving position and delivery position may be determined in advance, or may be input each time by an input device. When the width of the bag 10 is input to the input device, since the length of the conveyance path is known, the conveyance pitch of the endless belt 23 and the positions of the two punching units 4 and 5 in the conveyance direction (from here) The punching positions of the upper blade members 41, 51 and the lower blade members 42, 52), and the number of bags 10 on the conveyance path are determined. At this time, the interval D2 between the conveyed bags 10 is set to be a predetermined value or more (for example, 10 mm or more). This interval D2 may be determined in advance or may be input each time by an input device. This is because if the interval between the bags 10 is too narrow, the corners of the adjacent bags 10 may be cut when cutting. Therefore, if the minimum value of the interval between the bags 10 is determined in advance, the number of bags 10 that are simultaneously arranged on the conveyance path is also determined. For example, it can be set as follows.

(Pattern 1)
-Length L of conveyance path: 1620 mm (known)
-Bag width X: 220 mm
Bag delivery position (distance between the most downstream point and the bag) D1: 10 mm (predetermined)
-Adjacent bag spacing D2: 10 mm or more (predetermined)
Here, since the position of the bag 10 at the delivery position is fixed, this is subtracted and the pitch of the remaining bags 10 is calculated. That is, “(1620 mm−10 (D1) mm−220 mm (width of the bag 10 at the delivery position)) / (220 mm + 10 mm) = 6 plus 10 mm”, and the number of bags simultaneously conveyed includes the bag at the delivery position. Thus, 6 + 1 = 7. Then, when the remainder of 10 mm is divided by 6, it is 1.66 mm, so the bag transport pitch P is “220 mm + 10 mm + 1.66 mm = 2231.66 mm”. Moreover, according to the position where the bag 10 stops, the cutting position by each punch unit 4 and 5 is determined, and each punch unit 4 and 5 is moved. The cutting position by the punching units 4 and 5 is not particularly limited, but can be near the center of the conveyance path.

  When D1 and D2 are the same (for example, D1 = D2 ≧ 10), the calculation can be performed as follows. That is, “(1620 mm / (220 mm + 10 mm) = 7 remainder 10 mm”, and the number of bags simultaneously conveyed is 7. Then, dividing the remainder 10 mm by 7 yields 1.43 mm. The pitch P is “220 mm + 10 mm + 1.43 mm = 231.43 mm”.

  FIG. 10 is a model diagram of pattern 1 conveyance. In this pattern 1, the endless belt 23 conveys the bag 10 to the downstream side while stopping each time it moves 231.66 mm. In this example, the first corner 11 is cut by the first punching unit 4 at the fourth stop position among the seven stop positions in total, and the second punching unit 5 at the fifth stop position. The second corner 12 is set to be cut.

(Pattern 2)
-Length L of conveyance path: 1620 mm (known)
-Bag width X: 160 mm
Bag delivery position (distance between the most downstream point and the bag) D1: 10 mm (predetermined)
-Adjacent bag spacing D2: 10 mm or more (predetermined)
Calculation is performed in the same manner as in pattern 1 above. “1620 mm−10 (D1) mm−220 mm / (160 mm + 10 mm) = remainder 90 mm”, and the number of bags simultaneously conveyed is 8 + 1 = 9 including the bags at the delivery position. When the remainder of 90 mm is divided by 8, 11.25 mm is obtained, so the bag transport pitch P is “160 mm + 10 mm + 11.25 mm = 181.25 mm”. Although the calculation in the case of D1 = D2 is omitted, it is as shown in the pattern 1.

  FIG. 11 is a model diagram of pattern 2 conveyance. In this pattern, the endless belt 23 stops the bag every time it moves 181.25 mm, and conveys the bag 10 to the downstream side. In this example, the first corner 11 is cut by the first punching unit 4 at the fifth stop position among the nine stop positions in total, and the second punching unit 5 at the sixth stop position. The second corner 12 is set to be cut.

  As shown in FIGS. 10 and 11, in any of the above patterns, even if the width of the bag 10 changes, the upstream side of the bag 10 at the uppermost stream stop position, that is, the receiving position from the bag making apparatus 100. The edge on the side coincides with the most upstream point of the conveyance path. And in the stop position in the most downstream, ie, the delivery position of the bag to the processing apparatus 200, the bag 10 is arranged with a width of 10 mm from the most downstream point of the conveyance path.

<3. Operation of the cutting device>
The operation of the cutting apparatus configured as described above will be described. First, the width of the bag 10 to be cut is input to the control unit. As a result, the control unit determines the number of bags 10 to be arranged on the conveyance path, the conveyance pitch, and the positions of the punching units 4 and 5. Here, the pattern 1 is input. Following this, the endless belt 23 is intermittently driven at the determined conveyance pitch.

  And the bag 10 is supplied from the bag making apparatus 100 to the most upstream point of the conveyance path of the cutting apparatus. That is, as shown in FIG. 10, when the endless belt 23 is stopped, the bag 10 is transferred from the bag making apparatus 100 to the endless belt 23 so that the upstream edge of the bag 10 coincides with the most upstream point of the conveyance path. Deliver. By repeating this, the bags 10 are sequentially transferred from the bag making apparatus 100 to the endless belt 23, and the seven bags 10 are always conveyed by the endless belt 23. Then, the bag 10 being conveyed by the endless belt 23 is cut at the first corner 11 at the fourth stop position, and is cut at the second corner 12 at the fifth stop position.

  Thus, at the seventh stop position, that is, the most downstream position, the bag 10 stops at a position 10 mm away from the most downstream point of the transport path, and is handed over to the downstream processing apparatus 200 during this stop.

<4. Features>
With the cutting device configured as described above, the following effects can be obtained.
(1) In the present embodiment, the first corner portion 11 and the second corner portion 12 of the bag 10 are cut by different punching units 4 and 5, and the positions in the transport direction can be adjusted. . Therefore, by adjusting the conveyance pitch and the cutting position, even if the width of the bag 10 changes, the corners 11 and 12 at both ends of the bag 10 can be cut accurately as in the patterns 1 and 2 described above. The stop position when the bag 10 is discharged from the conveyance path can be aligned. Therefore, since the bag 10 discharged from the conveyance path can be delivered to the downstream processing apparatus 200 at the same position, the subsequent processing on the bag 10 can be performed smoothly. For example, each time the width of the bag changes, complicated processing such as adjusting the bag receiving location in the processing device becomes unnecessary. In addition, the delivery position of the bag 10 to the processing apparatus 200 may not be completely the same, and may be slightly shifted as long as the delivery to the processing apparatus 200 is not hindered. Therefore, it is possible to calculate the transport pitch in which the deviation is allowed in this way by the control unit 7. This also applies to the receiving position from the bag making apparatus 100.

(2) Since the pulleys 21 and 22 are formed in a gear shape, and the endless belt 23 includes a protrusion 231 that engages with the teeth of the pulleys 21 and 22, the pulleys 21 and 22 and the endless belt 23 can slip. The endless belt 23 can be driven at a high speed. Therefore, the processing speed can be improved. On the other hand, a flat region 233 in which no protrusion 231 is formed is formed in a portion where the through hole 232 is formed on the inner surface of the endless belt 23, and the flat region 233 is a support in which the suction port 33 is formed. It is comprised so that the surface 32 may be contact | connected. Therefore, since air is sucked through the through-hole 232 at the portion where the flat region 233 and the support surface 32 are in contact with each other, it is possible to prevent air from leaking. As a result, the bag 10 can be sucked quickly and firmly. With the above configuration, even when the bag 10 is transported at a high speed, it is possible to prevent the bag 10 from being displaced during transportation due to strong suction, and thus it is possible to prevent the cutting position and the delivery position from being displaced. .

(3) Since the through-holes 232 formed along a plurality of rows are arranged in a staggered manner so as not to line up in the horizontal direction in at least one set of rows, suction in the gap between the bag 10 and the bag 10 Leakage (air leakage) is reduced and the suction force is less likely to decrease. For example, even when the gap between the bag 10 and the bag 10 becomes large and the bag is not disposed in the through hole 232, the suction force is hardly reduced, and the bag 10 is firmly fixed to the endless belt 23 in the entire conveyance direction. can do.

(4) The cutting surface 411 of the upper blade member 41 includes an arcuate arc portion 413 and linear portions 414 and 415 extending obliquely from both ends thereof. Therefore, it is possible to prevent sharp burrs from being formed at the corners of the bag 10. For example, as shown in FIG. 12, if the straight portions 812 and 813 extend from both ends of the arc portion 811 so as to extend in the short side and long side directions of the bag 10, burrs are formed as follows. . That is, if the cutting position of the bag 10 is a preset position, both ends of the arc portion 811 coincide with the long side and the short side of the bag 10 as shown in FIG. On the other hand, as shown in FIG. 13, when the cutting position of the bag 10 is shifted, a step is formed from the connecting portion of the arc portion 811 and the linear portion 813 toward the long side of the bag, The end portion 102 forms a sharp corner.

  On the other hand, if the straight portions 414 and 415 are connected so as to extend at an angle of about 30 degrees from both ends of the arc portion 413 as in the present embodiment, when the cutting position is shifted, FIG. As shown, a step is formed from the connecting portion of the arc portion 413 and the straight portions 414, 415 toward the long side of the bag 10, which becomes the burr 101, but the end portion 102 of the burr 101 forms an obtuse angle. To do. Therefore, the burr 101 can be made inconspicuous. In FIG. 14, for convenience of explanation, an angle is provided at a connecting portion between the arc portion 413 and the straight portions 414 and 415, but in reality, the straight portions 414 and 415 are tangent to each end of the arc portion 413. Because of the contact, the burr 101 can be made almost inconspicuous. Moreover, in this connection part, the linear parts 414 and 415 do not need to extend in the tangential direction of the edge part of the circular arc part 413, for example, if a connection part becomes an obtuse angle, a burr | flash will not be conspicuous. Can do.

<5. Modification>
As mentioned above, although one Embodiment of this invention was described, this invention is not limited to the said embodiment, A various change is possible unless it deviates from the meaning.

<5-1>
In the above embodiment, the bags 10 are transported in a line on the transport path. For example, as shown in FIG. 15, the bags 10 can be transported in two or more lines. In this case, in the 1st punching unit 4, the upper blade member 48 which cuts an adjacent corner part can be integrated, and it can comprise so that it may have the two cutting surfaces 411. FIG. In this respect, the lower blade member 42 and the second punching unit 5 can be similarly configured.

<5-2>
In the above embodiment, the positions of the two punching units 4 and 5 in the transport direction can be controlled. However, when the width of the bag 10 to be cut is limited, only one of the positions is changed. Thus, even if the width of the bag 10 changes, the corners 11 and 12 can be cut accurately, and the bag 10 can be supplied to the processing apparatus at the same position. Further, the adjustment of the positions of the punching units 4 and 5 can be manually performed based on the output from the control unit.

<5-3>
The configurations of the endless belt 23, the pulleys 21 and 22, and the support base 3 are not particularly limited, and may be configurations other than those described above, and the number and position of the pulleys can be set as appropriate. In the above embodiment, the pulleys 21 and 22 are formed in a gear shape so that high-speed conveyance can be performed, and in accordance with this, the protrusion 231 is formed on the endless belt 23 or the groove 31 is formed on the support base 3. However, depending on the conveyance speed or the like, the endless belt 23 without the protrusion 231 may be used.

<5-4>
In the said embodiment, the input with respect to a control unit can be changed suitably. For example, the interval between adjacent bags 10 may be determined in advance according to the width of the bags 10. Therefore, when the width of the bag 10 is input, since the length of the conveyance path and the interval between the bags 10 are known, the control unit may calculate the conveyance pitch and the cutting position. In addition, for example, the width dimension of the bag 10 may be received directly from an upstream packaging machine or the like without being directly input, and the width data may be automatically input. As long as there is a means for inputting width data in accordance with the change in the width dimension of the bag 10, the apparatus and method are not particularly limited.

  In addition, when the widths of the plurality of types of bags 10 are determined in advance, the intervals of the bags 10, the conveyance pitch, and the cutting position are stored in advance, and the width of the bag 10 (or the type of the bag) is input. The stored data can be read out to set the cutting device. As for the cutting position, the conveyance pitch is calculated by the width dimension of the bag 10 and the cutting position is also determined. However, each punching means may be automatically moved to the calculated cutting position. The operator may confirm and manually move each punching means, and the control method of each punching means is not particularly limited.

<5-5>
In the above embodiment, the conveyance path is defined between the most upstream point and the most downstream point of the endless belt 23, and the length of the conveyance path is the length of the conveyance path. However, the setting of the conveyance path is not limited thereto. That is, the length of the conveyance path can be appropriately set depending on the receiving position from the bag making apparatus 100 to the endless belt 23 and the delivery position to the processing apparatus 200. Therefore, the receiving position and the delivery position other than those in the above embodiment can be set as appropriate.

<5-6>
In both the punching units 4 and 5, the corners 11 and 12 of the bag 10 are punched in an arc shape, but the shape is not limited to an arc shape. For example, the corners 11 and 12 are diagonally cut out linearly or straight and curved. It is also possible to perform processing such as cutting into a mixed shape. Further, only one of the pair of first corner portions 11 or second corner portions 12 can be punched out. Furthermore, after the first and second punching units 4 and 5 are replaced and the second corner 12 is cut, the first corner 11 can be cut. Further, the first and second punching units 4 and 5 can be simultaneously operated and cut.

<5-7>
In order to perform high-speed processing, the rotational speed of the drive pulley 21 can be increased, and the stop time can be shortened.

<5-8>
In the said embodiment, although the example which applied the cutting device concerning this invention to the cutting of the bag 10 was shown, this invention is applied also to the cutting of the corners of flat materials, such as a sheet material, besides the cutting of a bag. can do.

10 bags (flat materials)
11 First corner 12 Second corner 21 Drive pulley 22 Driven pulley 23 Endless belt 231 Projection 232 Through hole 3 Support base 32 Support surface 33 Suction port 4 First punching unit (first punching means)
5 Second punching unit (second punching means)
7 Control unit (control means)

Claims (6)

A cutting device that sequentially cuts a plurality of rectangular flat materials sequentially transferred from a supply device,
A conveying means having a conveying path for intermittently conveying the flat material at a predetermined pitch;
In the flat material conveyed by the conveying means, a first punching means, which is disposed so as to be movable in the conveying direction by punching a corner of one end of the upstream side or the downstream side in the conveying direction;
In the flat material conveyed by the conveying means, the corner of the other end of the upstream side or the downstream side in the conveying direction is punched out, so that it can move in the conveying direction downstream from the first punching means. A second punching means arranged;
Input means for receiving an input of the length of the flat material in the transport direction;
Based on at least the length of the flat material in the transport direction and the length of the transport path, the pitch by the transport means, and the position in the transport direction of at least one of the first punching means and the second punching means, Control means for determining,
A cutting device.   2. The cutting apparatus according to claim 1, wherein the control unit determines positions of both the first punching unit and the second punching unit in the transport direction. The transport means is configured to transport the flat material along a plurality of rows extending in the transport direction,
The said 1st punching means and the 2nd punching means are each comprised so that the edge part of the one end of the flat material of each said row | line and the corner part of the other end part may be punched out. Cutting device. The conveying means is
At least one drive pulley;
At least one driven pulley;
An endless belt that is stretched over the drive pulley and the driven pulley and has a plurality of through holes;
In a portion corresponding to a conveyance path for conveying the flat material, a support base for supporting the endless belt;
A suction means provided on the support base, for sucking air through the through hole from the outside to the inside of the endless belt;
With
At least one of the drive pulley and the driven pulley is formed in a gear shape,
On the inner surface of the endless belt, a plurality of protrusions that are engaged with the teeth of the driving pulley or the driven pulley formed in a gear shape are formed,
The plurality of protrusions extend in a direction perpendicular to the transport direction, and are arranged at a predetermined interval in the transport direction,
On the inner surface of the endless belt, a flat region where the protrusion is not formed is provided in a portion corresponding to the region where the through hole is formed,
The support base has a support surface in contact with the inner surface of the endless belt at a position corresponding to the flat region;
The cutting device according to any one of claims 1 to 3, wherein a suction port for sucking air by the suction means is formed on the support surface.   The plurality of through holes are formed along a plurality of rows along the transport direction, and at least one set of adjacent rows is formed in a staggered manner so that the through holes do not line up in the horizontal direction. The cutting device according to claim 4. The first and second punching means are:
Has a cutting blade,
The edge portion of the cutting blade includes an arc portion that cuts the corner portion into an arc shape, and a pair of linear portions that extend from both sides of the arc portion in the tangential direction of each end portion of the arc portion. The cutting device according to any one of claims 1 to 5.